been reading this forum since few years, now its time to go more active.
I would like to present my new design - hand-held sequencer/synthesizer.
Sound engine contains 3 square wave generators and 4 triangle/square wave LFOs. 3 LFOs modulate pulse width of 3 DCOs, while fourth LFO act as output volume modulator - its frequency goes to audio range. You can create 2 8-step sequences simultanously: sound pitch (note) sequence and note slide sequence. The interface is extremely reduced (only 2 knobs, 2 pushbuttons and 2 switches), but creating new sequences is quite easy. Device has also 8 memory slots, each holds 8 step note and slide sequence. Circuit uses no DAC, all waveforms are mixed analogue. All fits in mint can and is powered with 9V battery.

i'm in the middle of circuit / software redesign. I've added simple drum machine and improved synth engine (chords, oscillator sync, manual PWM and more). It sounds much better now and is quite power efficient. I will make some demo, after i finish.

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